Very interesting piece of history in the video media below. Now I will point out, they could have asked me. I heard the bona fide Rebel Yell as a boy growing up in the 1950s from men who had learned it from their fathers, and they from theirs, etc. My father would do the Rebel Yell when he got up in the morning when we were staying in our cabin in the Ouachita Mountains, just to get the day going with energy. By the way the Yell's origin in found among the Gaelic war cries practiced in Ireland and Scotland and transported to the New World by the Diaspora.